Metal-bending machine



(No Model.)

W. W. GREEN. METAL BENDING MACHINE.

Patented Feb. 11,1890.

UNITED STATES PATE T OFFICE.

WVILLIAM \V. GREEN, OF CHICAGO, ILLINOIS.

METAL-BENDING MACHINE.

SPECIFICATION forming part of Letters Patent No. 420,935, dated. February 11, 1890.

Application filed November 2, 1888. Serial No. 289,813. (No model.)

To all? whom it may concern:

Be it known that I, W'lLLIAM W. GREEN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Metal-Bending Machines, of which the following is a full, clear, and exact description, that will enable Others to make and use the same, reference being had to the accompanying drawings, forming a part of this specification.

The object of this invention is to providea machine for bending a strip or flat piece of metal edgewise, as will be hereinafter set forth.

Figure 1 is a plan of a machine embodying my improved features; Fig.2, a vertical transverse section in plane 2, Fig. 1; Fig. 3, a vertical transverse section in plane 3, Fig. 1; Fig. 4, a vertical section in plane 4, Fig. 1.

Referring to the drawings, A represents the bed-frame, upon which the operating mechanism is mounted, and A the supportinglegs.

The circular bending or forming die B is rigidly mounted on the pivot-shaft B, journaled in the bed-frame, and turns therewith. The projecting end B is a part of the bending-die B and moves around with thesame. The periphery or outer edge of the die B is cut away from the top down to about onehalf its thickness to provide the seatingledge a. The curved clamping-plate B fits into and corresponds to the part cut away to form the ledge a. The bolts (0' a are loosely inserted through the clamping-plate and have a threaded engagement with the die B, and serve the purpose of retaining the clampingplate in proper relative position. The inner ends of the rectangular plates a a are bolted to the body of the die B and extend outward over the'curved clamping-plate B as shown in Fig. 1. The screw clamping-bolts (L5 a are threaded in the outer ends of the plates (1 c and have a bearing on top of the clamping plate B and thereby rigidly clamp and hold the strip of metal B in the movable die il uring the operation of bending, as shown in The stationary die-block C is rigidly secured to the bed-frame, and is curved out along a part of. the inner face, as at b, to correspond to the contour of the movable bending-die. This stationary die block is provided with the recess 1), in which is inserted the strip of metal to be bent, as shown in Fig. 4.

The lower end of the vertical Windlassshaft D is journaled in the bed-frame at the back end, while the upper end is suitably supported in the angle-bracket 11 as shown in Figs. 1 and 3. A ring-bolt b is inserted in the forming-die at one side, and has one end of the purchase-chain D attached thereto, the opposite end being attached to the Windlass-shaft D, the chain, however, being rove first over the sheave d, then over the guide-roller d, journaled in the bracket C1 and back again over the sheave cl to the windlass, for the purpose of increasing the purchase and power. The windlass-shaftis provided with one or more apertures (1 for the insertion of the hand-lever F for operating the movable die. The sheave d is journaled on the shaft d The machine is shown in its normal position, (see Fig. 1,) and has a strip of metal inserted ready for the operation of bending.

The plate 9 is bolted to the projecting end B of the movable die B, and is providedwith one or more clamping-bolts g, for securing and holding theinner end of the strip of metal. By rotating the windlassshaft the movable die turns on its pivot and the strip of metal is bent into a form corresponding to the periphery of the bending-die.

The machine illustrated is operated by hand; but it is obvious that a very slight change would be required to convert. the same into a power machine Having thus described my invention, whatI claim as new, and desire to secure by Letters Patent, is=

1. In a bending machine, the combination,

with the supporting bed-frame, of a bendingdie rigidly mounted and turning on a pivotshaft and provided with a seating-ledge, as described, a curved clamping-plate adj ustably secured on said ledge, and a stationary dieblock provided with a recess and rigidly secured to the bed-frame, substantially as and for the purpose set forth.

2. In a metal-bending machine, the eombichain is rove, and the fixed die C, substannation,with the movable bending-die mounted tially as and for the purpose set forth. and turning on a pivot-shaft, of a Windlassshaft journaled in the bed-frame, a purchase- W'ILLIAM V. GREEN. 5 chain, the respective ends whereof are se- Witnesses:

cured to said die and Windlass-shaft, the L. M. FREEMAN,

sheave (Z, the guide-roller cl, over which said L. B. COUPLAND. 

